Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Empire of Mithradates
Mightier than any native monarch for many a day had been, Mithradates bore rule alike over the northern and the southern shores of the Black Sea and far into the interior of Asia Minor. The resources of the king for war by land and by sea seemed immeasurable.
His recruiting field stretched from the mouth of the Danube to the Caucasus and the Caspian Sea; Thracians, Scythians, Sauromatae, Bastarnae, Colchians, Iberians (in the modern Georgia) crowded under his banners; above all he recruited his war-hosts from the brave Bastarnae. For his fleet the satrapy of Colchis supplied him with the most excellent timber, which was floated down from the Caucasus, besides flax, hemp, pitch, and wax; pilots and officers were hired in Phoenicia and Syria.
The king, it was said, had marched into Cappadocia with 600 scythe-chariots, 10,000 horse, 80,000 foot; and he had by no means mustered for this war all his resources. In the absence of any Roman or other naval power worth mentioning, the Pontic fleet, with Sinope and the ports of the Crimea as its rallying points, had exclusive command of the Black Sea.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=25